小麦叶片性状和粒数叶比研究

对 1 0个小麦品种 (系 )的叶片性状和粒数叶比进行了研究。结果表明 :小麦叶面积与产量因素间的关系十分密切 ,与单位面积穗数呈极显著的负相关 ,与穗粒数、穗粒重呈极显著的正相关 ;主穗粒数 /旗叶面积与籽粒产量呈极显著的正相关 ,与各产量因素相关不密切 ,可作为高产育种的重要选择指标。     

兰州百合组织培养和高频繁殖

采用人工低温及自然冬季萌芽两条路线进行兰州百合（L．davidiivat．unicolor（Hoog）Cotton）鳞片外植体初代诱导培养，以MS＋0．0～1．0mg／LBA＋0．0～0．1NAA为初代培养基，成功实现了南方高温地区兰州百合组织培养初代诱导。低温冷藏有利于鳞芽诱导，但不是鳞芽诱导的必要条件。采用MS＋0．0～0．5BA＋0．0～0．1NAA继代培养基，高温（28～29℃）培养与丛芽继代方式实现了兰州百合高频繁殖，其繁殖系数达3．0～5．0，继代周期为16～18d；组培生根苗的分单株大田移栽方法提高了成活率，降低了用苗量；为工厂化生产其组培苗及炼苗移栽提供了技术支持。     

Effect of Chemical Composition on Formation Performance of 7050 Alloy Billets

The casting technology of 7050 alloy bilits is researched. that are used to produce slabs for air materials.Because the composition of 7050 alloy is very complex,the Cu and Zn elements contents are higher and Fe and Si impurity elements contents are controlled lower, at the same time ,the specification and the width-thickness ratio are large ,all of above result the tremendous crack trend when casting and bad casting formation performance . The formation performance of 7050 alloy has been improved and qualified billits are obtained by optimizing the composition of 7050 alloy, including raising Fe/Si ratio and Zn/Mg ratio ,reducing Cu content and adopting the joint refinement with block and silk shaped Al-5Ti-1B.     

Control Method of Voltage-reactive Power of Substation Based on the Real Time Adjusting Voltage Calculation

The main means of the voltage-reactive power control of substation are adjusting the taps of load-tap-changing transformer or the reasonable capacity of parallel compensating capacitors according to the operation condition of substation.The "nine-area control strategy" is widely used to adjust voltage in the stated range and reduce the transmission capability of reactive power for power system at present.By analyzing the existent shortages of nine-area control mode for voltage-reactive power,an adjusting voltage calculation method is put forward,input data of which are the real time data of current,voltage and power of the substation.Then operation decision of voltage-reactive power control method of substation is made.By the simulating analysis,predigesting method of upper system is built,based on which an applied real time calculating model and calculating steps is given.     

General Phasor Diagram and Power-angle Characteristic Equations of Extra High Voltage Long Distance Transmission Line

Installing compensation equipments is a good manner to improve line transmission capacity and maintain power system stability in the extra high voltage(EHV) long distance transmission line.It is of benefit to analysis and control by describing the effect of compensation equipment correctly.At present,for predigesting analysis or increasing real-time calculating speed,concentrated parameter circuit model is widely used to analyze 500 kV EHV long distance transmission line which may cause bigger error.So it is necessary to get a more reasonable model.On the basic of voltage and current distributed equations of even distributed long distance line,this paper deduces phasor diagram and power-angle character equations of uncompensated long line.Then the authors analyze the effect of compensators and define two characteristic parameters,namely,equivalent impedance x_(eq) and voltage coefficient K_V.Any compensating states of EHV long distance transmission line,example installing the compensators in the line or not or which type of compensators,is described by the general phasor diagram and power-angle characteristic equations.Furthermore,increment calculation(equations) of two characteristic parameters is presented by the compensator parameters which may make the concepts clear and predigests analysis easily.     

Analysis on the Optimal Operation in Hydroelectric Station of Gezhouba

The optimal operation in hydroelectric station unit is me opumum problem,which include unit commitment,load distribution and unit maintenance. The authors research the optimal operation in units in hydroelectric station of Gezhouba by the genetic algorithm and dynamic programming to satisfy the demand of economic operation of Gezhouba. They arrange and organize the program of the units in r6ason to go for the better benefit and satisfies security, credibihty and high quality of electric production . These methods can work out the most optimum result. When the head of water and the flux is confirmed they can distribute the flux to the units to realize the optimal operation of the scheduling in Gezhotlba.     

花生生产机械发展现状及趋势

介绍花生生产各环节(播种、收获、摘果、脱壳)的机械发展现状,探讨花生生产机械的主要发展趋势,根据我国及辽宁省的实际情况,分析花生生产机械的市场需求及发展前景,为花生生产机械的快速发展提供理论参考。     

广西山茶属木材解剖分子研究

对采自广西的9个组47种山茶属木材解剖分子进行了测定研究,研究表明,山茶属木材的各种解剖分子显示长度长、直径小、胞壁薄的特点,属于比较原始的种系。山茶属解剖分子特征还表明,其木材密度大,各种力学强度也大,是很好的纤维工业用原料和农具柄及工艺用材。     

小麦株高构成指数的研究

对 1 0个小麦品种 (系 )的株高构成指数进行了研究。结果表明 ,株高构成指数在品种间存在着极显著差异 ,该值的提高可通过杂交选择来实现。各I值与克草粒数、经济系数和籽粒产量均呈正相关 ,I1值与产量的相关达到了极显著水平 ,可作为高产育种的重要筛选指标。